CVE-2026-11326 Security feature bypass in OpenAI Atlas
An XSS vulnerability in a forum allowed attackers to access privileged browser APIs, exposing history and controlling tabs in OpenAI Atlas.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-11326?
CVE-2026-11326 is a medium-severity vulnerability in OpenAI Atlas, published on 5 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
OpenAI Atlas before 1.2025.288.15 exposed privileged browser APIs to web content on *.openai.com origins. A cross-site scripting vulnerability in forum.openai.com could be used to access these functions, allowing access to browser history information and the ability to open or close tabs. OpenAI Atlas 1.2025.288.15 narrows access to these APIs to *.chatgpt.com; users should upgrade to 1.2025.288.15 or later.
Weakness: CWE-284
Which versions are affected by CVE-2026-11326?
How do I fix CVE-2026-11326?
No fix has been published for CVE-2026-11326 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-11326 being exploited?
There is no known exploitation of CVE-2026-11326 in the wild and no public exploit code.
Sources
Also known as GHSA-x355-jg5j-p4h6.